+static inline void value_init (union value *, int width);
+static inline bool value_needs_init (int width);
+static inline bool value_try_init (union value *, int width);
+static inline void value_destroy (union value *, int width);
+
+static inline double value_num (const union value *);
+static inline const uint8_t *value_str (const union value *, int width);
+static inline uint8_t *value_str_rw (union value *, int width);
+
+static inline void value_copy (union value *, const union value *, int width);
+void value_copy_rpad (union value *, int dst_width,
+ const union value *, int src_width,
+ char pad);
+void value_copy_str_rpad (union value *, int dst_width, const uint8_t *,
+ char pad);
+void value_copy_buf_rpad (union value *dst, int dst_width,
+ const uint8_t *src, size_t src_len, char pad);
+void value_set_missing (union value *, int width);
+int value_compare_3way (const union value *, const union value *, int width);
+bool value_equal (const union value *, const union value *, int width);
+unsigned int value_hash (const union value *, int width, unsigned int basis);
+
+bool value_is_resizable (const union value *, int old_width, int new_width);
+bool value_needs_resize (int old_width, int new_width);
+void value_resize (union value *, int old_width, int new_width);
+
+static inline void value_swap (union value *, union value *);
+
+struct pool;
+void value_init_pool (struct pool *, union value *, int width);
+void value_resize_pool (struct pool *, union value *,
+ int old_width, int new_width);
+\f
+/* Initializes V as a value of the given WIDTH, where 0
+ represents a numeric value and a positive integer represents a
+ string value WIDTH bytes long.
+
+ A WIDTH of -1 is ignored.
+
+ The contents of value V are indeterminate after
+ initialization. */
+static inline void
+value_init (union value *v, int width)
+{
+ if (width > MAX_SHORT_STRING)
+ v->long_string = xmalloc (width);
+}
+
+/* Returns true if a value of the given WIDTH actually needs to
+ have the value_init and value_destroy functions called, false
+ if those functions are no-ops for values of the given WIDTH.
+
+ Using this function is only a valuable optimization if a large
+ number of values of the given WIDTH are to be initialized*/
+static inline bool
+value_needs_init (int width)
+{
+ return width > MAX_SHORT_STRING;
+}
+
+/* Same as value_init, except that failure to allocate memory
+ causes it to return false instead of terminating the
+ program. On success, returns true. */
+static inline bool
+value_try_init (union value *v, int width)
+{
+ if (width > MAX_SHORT_STRING)
+ {
+ v->long_string = malloc (width);
+ return v->long_string != NULL;
+ }
+ else
+ return true;
+}
+
+/* Frees any memory allocated by value_init for V, which must
+ have the given WIDTH. */
+static inline void
+value_destroy (union value *v, int width)
+{
+ if (width > MAX_SHORT_STRING)
+ free (v->long_string);
+}
+
+/* Returns the numeric value in V, which must have width 0. */
+static inline double
+value_num (const union value *v)
+{
+ return v->f;
+}
+
+/* Returns the string value in V, which must have width WIDTH.
+
+ The returned value is not null-terminated.
+
+ It is important that WIDTH be the actual value that was passed
+ to value_init. Passing, e.g., a smaller value because only
+ that number of bytes will be accessed will not always work. */
+static inline const uint8_t *
+value_str (const union value *v, int width)
+{
+ assert (width > 0);
+ return (width > MAX_SHORT_STRING ? v->long_string : v->short_string);
+}
+
+/* Returns the string value in V, which must have width WIDTH.
+
+ The returned value is not null-terminated.
+
+ It is important that WIDTH be the actual value that was passed
+ to value_init. Passing, e.g., a smaller value because only
+ that number of bytes will be accessed will not always work. */
+static inline uint8_t *
+value_str_rw (union value *v, int width)
+{
+ assert (width > 0);
+ return (width > MAX_SHORT_STRING ? v->long_string : v->short_string);
+}
+
+/* Copies SRC to DST, given that they both contain data of the
+ given WIDTH. */
+static inline void
+value_copy (union value *dst, const union value *src, int width)
+{
+ if (width <= MAX_SHORT_STRING)
+ *dst = *src;
+ else if (dst != src)
+ memcpy (dst->long_string, src->long_string, width);
+}
+
+/* Exchanges the contents of A and B. */
+static inline void
+value_swap (union value *a, union value *b)
+{
+ union value tmp = *a;
+ *a = *b;
+ *b = tmp;
+}
+
+#endif /* data/value.h */